.myclass span{
    display: none;
}
.play{
    border-radius: 20px;
}

.video-react-big-play-button.video-react-big-play-button-center.myclass{
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    opacity: 0.3;
    border-style: none;
}